Traveling-grate furnace



Jan. 15 1924. H 1,480,965

. L. STEINMULLER ET AL TRAVELING GRA'I'E FURNAGE Filed Feb. 11, 1921 2 Shuts-Shut l Jan. 15 1924.

L. STEINMI'JLLER ET AL TRAVELING GRATE FURNACE Filed Feb, 11. 1921 2 Shanta-Shut 2 IebgcZTS fzi again 49g:22:82:25,604c

Mme as:

Patented Jan. 15, 1924.

UNITED STATES PATENT OFFICE.

LEBRECHT STEINMtlLLER, OF GUMMERSBACH, GERMANY, AND MAX GENSCH, DE-

CEASED; BY ELSE GENSCH, BORN SEEGER, EXECUTRIX, OF GUMMEBSBAGH, BHINE,

GERMANY.

TBAVELING-GRATE FURNACE.

Serial Nb. 444,227.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921,41 STAT. L, 1813.)

To all whom it may concern:

Be it known that We, LEBRECHT S'rmNMr'iL- mm, a citizen of the German Empire, and resident of Gummersbach, Province of the c Rhine, Germany, and ELSE Gnivscn, born Simona, a citizen of the German Empire, and a resident of Gummersbach, Province of the Rhine, Germany, executrix of the estate of the late MAX UrnNsoH, formerly a German citizen, and joint inventor with the said LE- naacrrr S'rmNMI'iLmn, are in joint possession of an invention in new and useful Improvements in Traveling-Grate Furnaces (for which we have filed applications in Germany Dec. 11, 1913, Patent No. 291,502; Austria Dec. 4, 1915, Patent No. 75,351; Hungary Dec. 30, 1915, Patent No. 69,970; Switzerland Dec. 9, 1915, Patent No. 72,461' Sweden Dec. 31, 1915, Patent No. 11,218; benmark Dec. 10, 1915, Patent No. 22,361; Norway Dec. 11, 1915, Patent No. 27,392; France Feb. 26, 1919, Patent No. 518,094; Italy April 22, 1919 (application pending) ,Spain Feb. 19, 1919, Patent No. 69,096; Holland Jan. 4,

1916, Patent No. 1,048; Belgium Sept. 27, 1919, PatentNo. 282,477; Great Britain Oct. 7, 1919, Patent No. 133,691), of which the following is a specification.

This invention relates to traveling grate 80 furnaces and more particularly to the provision at the rear end of the rate of a fuel collector or device for collecting the fuel at the rear end of the grate prior to its discharge.

86 According to the present invention the fuel collector at the rear end of the grate is provided with air openings, the fuel collector being preferably constructed in the "form of a grate, so that air can enter the furnace above the grate from the rear end thereof, It is thuspossible to consume the partially consumed fuel at the rear end of the grate to a much greater extent since the air enterin the furnace through the fuel 46 collector wil be preheated firstly by contact with the rear end of the grate and also by penetrating through the fuel collector and the fuel collected in front thereof, final- 'ly reaching the forward portion of the fuel collected in front of the fuel collector in a more or less preheated state so that any partially unconsumed fuel in front of the collected fuel, will be completely consumed.

The fuel collector is preferably constructed of a series of adjacent individually movable members which may be individually weighted so that the fuel collector may adapt itself over the whole breadth of the grate to varying conditions. For example, it is well-known that a greater layer of fuel collects at the sides of the grate than in the middle and in consequence thereof the members of the fuel collector at the sides of the grate may be loaded to a greater extent than the more central members of the fuel collector.

Preferably the lower inner surface of the fire bridge or its equivalent on which the fuel collector is supported, is inclined downwardly and rearwardly so that in the event of the clinker agglomeratin to form large lumps, the latter will be crus ed between the inclined inner face of the fire bridge and the travelin grate, and their discharge thereby facilitated.

In order that the invention may be more clearly understood, reference is hereinafter made to the accompanying drawings showing various forms of the improved fuel collector by way of example.

Fig. 1 is a diagrammatic view of the rear end of a travelin grate furnace, in which the fuel collector 1s provided with air openings over its entire surface.

Fig. 2 illustrates diagrammatically a modification thereof in which the air openings are confined to the lower part of the fuel collector.

Fig. 3 illustrates in transverse section a further modification in which the upper part of the fuel collector is not provided with air openings but comprises a water-cooled fire bridge to which the lower part of the fuel collector is pivotally connected.

Fig. 4 illustrates in transverse section on line H of Fig. 5 a modification of the device illustrated in Fig. 3 in which the grate bars of the fuel collector are detachably arranged in a rate carrier.

Fig. 5 is a ragmentary rear view showing one of the fuel collectors shown in Fig. 4.

Fig. 6 is a fragmentary section on line 6-6 of Fig. 4. Fig. 7 is a detail section corresponding to Fig. 1 with the rate bars 6 and rollers g removed. Fig. 8 s ows one of the grate bars in detail.

Referring to the drawings, a indicates the traveling grate, and b the fire bridge or its equivalent located near the rear end of the furnace. 7

As illustrated in Fig. l the fuel collector comprises a plurality of grate members 0 having air openings distributed over the whole surface thereof so that suflicient air is supplied, therefrom for the complete combustion of the fuel collected in front of the members a.

In the construction illustrated the fuel collector arrests the fuel'hy its own weight until its weight is overcome b the pressure of the fuel collected in front thereof.

In the construction illustrated in Fig. 2, the grate members 0 of the fuel collector are provided only with air openings in the lower part thereof so as to insure that air will not enter the furnace chamber in the event of the layer of fuel in front of the fuel collector, not extending to a sufficient height to reach the fire bridge 5.

n the construction illustrated in Fig. 3, the fire bridge I), is provided with a watercooled channel or like member to extending across the whole width of the furnace and to which individual fuel collectors c are pivoted. In this case, as illustrated, the lower inner surface of the water-cooled chamber w is inclined downwardly and rearwardly so that in the event of lar e lumps of clinker forming in front of the fuel collectors 0 they will be crushed between the lower face of the water-cooled chamber w and the traveling grate a owing to the motion of the latter.

In the construction illustrated in Figs 4 and 5, the fuel collector comprises a plurality of grate members or bars 6 fitted between transverse carriers or supports d and secured in any suitable manner, as for example by means of locking bars 7. The transverse carriers d as shown, are supported on frames comprising arms 5 pivotally mounted on the water-cooled chamber 10 so that the arms i may be swung upwardly and the grate bars 6 removed or exchanged by removing the locking bars f. In this construction each frame is shown provided with a weight 9 comprising a plurality of rollers loosely mounted upon a shaft h supported by the arms t.

It will be noted from Figs. 1, 2, 3 and l of the accompanying drawings that a considerable quantity of fuel is collected in front of the fuel collector whilst a certain layer of ash mixed with fine particles of clinker or the like constantly passes underneath the fuel collector, air entering through lhe'openings in the fuel collector into the fuel collected in front of the fuel collector. It will be obvious that the particles of coal in proximity to the fuel collector will be further consumed than the particles of fuel 3 and 4 it is possible to provide for a com-.

puratively high collection of fuel but it will of course be understood that this is dependent on the nature of the'fuel employed and that in other cases it may be suilicient to 7 provide for a smaller collection of fuel in the manner illustrated in Figs. 1 and 2.

Claims:

1. In a traveling grate furnace, the combination with the traveling grate, of a wall overhangingthe discharge end thereof and having its lower edge so spaced therefrom that ample opening is provided for the egress of ashes and clinkers, a plurality of members supported adjacent said wall each extending into the body of fuel on the grate and each inde endentlv vieldingly opposing movement of uel towards the discharge end thereof, said members being designed and constructed to cooperate in maintaining a bank of fuel on. said grate beneath said wall which, together with said members, sub stantially closes the opening between the" grate and wall to the passage of free oxygen and said members sage of ashes and cllnkers, Without releasing the bank.

2. In a traveling grate furnace, the combination with the traveling grate, of a wall overhanging the discharge end thereof and having its lower edge so spaced therefrom that ample opening is provided for 'the egress of clinkers, a plurality of members each of which is mounted to swing independently of the others about an axis adjacent the lower edge of said wall'and extending downwardly into the fuel on the grate, weight members secured to said swinging members to increase the resistance of said swingin members to the passage of fuel, said swinging members causing a bank of fuel to be maintained on the grate in advance of said members, and said members and the fuel bank formed thereby substantially closing the opening between the grate and wall against the passage of free oxygen into the combustion space.

3. In a traveling grate furnace, the combination with the traveling grate, of a wall overhanging the discharge end thereof and having its ower edge so spaced therefrom that ample opening is provided for the ielding to permit 'pasegress of clinkers, a plurality of members each mounted to swing independently of the others about an axis adjacent the lower edge of said wall and extending downward- 1y into the fuel on the grate, weights detachably secured upon sald swinging members to increase the resistance of said swingin members to the passage of fuel, said swmging members being designed and con- 1 structed to cause a bank of fuel to be mamthe passage of free oxygen to the combus- 15 tion space.

LEBRECHT STEINMULLER. ELSE GENSCH, GEB. SEEGER, Eweouitn'w of Man: Gensch, deceased. 

